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https://issues.apache.org/jira/browse/FLINK-27748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17580525#comment-17580525
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john commented on FLINK-27748:
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[~knaufk]  Probably not, maxParallelism controls the total concurrency of the 
job, and we want to control the concurrency of a specific operator.

> AdaptiveScheduler should support operator fixed parallelism
> -----------------------------------------------------------
>
>                 Key: FLINK-27748
>                 URL: https://issues.apache.org/jira/browse/FLINK-27748
>             Project: Flink
>          Issue Type: Improvement
>          Components: Runtime / Task
>            Reporter: john
>            Priority: Minor
>
> In the job topology, if the user specifies the concurrency of the operator, 
> AdaptiveScheduler should support the operator's maximum parallelism equal to 
> the user-specified parallelism during the scheduling process. And the minimum 
> parallelism is equal to the number of slots available to the cluster. 
> This is especially useful in certain scenarios,
> For example, the parallelism of an operator that consumes Kafka is specified 
> to be equal to the number of partitions. Or you want to control the write 
> rate of the operator, etc.



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